diff options
author | Anup Patel <anup.patel@wdc.com> | 2020-06-01 14:45:39 +0530 |
---|---|---|
committer | Palmer Dabbelt <palmerdabbelt@google.com> | 2020-06-09 19:11:20 -0700 |
commit | d175d699df07041befda3779f29bf7126c298730 (patch) | |
tree | 836e0da380d6b6e4ed2cc1cd50359c1ed75f2978 /arch | |
parent | 5cf998ba8c7bbbfec3e0d6534c9a3f860ab9920e (diff) | |
download | linux-d175d699df07041befda3779f29bf7126c298730.tar.bz2 |
RISC-V: Rename and move plic_find_hart_id() to arch directory
The plic_find_hart_id() can be useful to other interrupt controller
drivers (such as RISC-V local interrupt driver) so we rename this
function to riscv_of_parent_hartid() and place it in arch directory
along with riscv_of_processor_hartid().
Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
Reviewed-by: Palmer Dabbelt <palmerdabbelt@google.com>
Acked-by: Palmer Dabbelt <palmerdabbelt@google.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
Reviewed-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
Diffstat (limited to 'arch')
-rw-r--r-- | arch/riscv/include/asm/processor.h | 1 | ||||
-rw-r--r-- | arch/riscv/kernel/cpu.c | 16 |
2 files changed, 17 insertions, 0 deletions
diff --git a/arch/riscv/include/asm/processor.h b/arch/riscv/include/asm/processor.h index 3ddb798264f1..b1efd840003c 100644 --- a/arch/riscv/include/asm/processor.h +++ b/arch/riscv/include/asm/processor.h @@ -75,6 +75,7 @@ static inline void wait_for_interrupt(void) struct device_node; int riscv_of_processor_hartid(struct device_node *node); +int riscv_of_parent_hartid(struct device_node *node); extern void riscv_fill_hwcap(void); diff --git a/arch/riscv/kernel/cpu.c b/arch/riscv/kernel/cpu.c index 40a3c442ac5f..6d59e6906fdd 100644 --- a/arch/riscv/kernel/cpu.c +++ b/arch/riscv/kernel/cpu.c @@ -44,6 +44,22 @@ int riscv_of_processor_hartid(struct device_node *node) return hart; } +/* + * Find hart ID of the CPU DT node under which given DT node falls. + * + * To achieve this, we walk up the DT tree until we find an active + * RISC-V core (HART) node and extract the cpuid from it. + */ +int riscv_of_parent_hartid(struct device_node *node) +{ + for (; node; node = node->parent) { + if (of_device_is_compatible(node, "riscv")) + return riscv_of_processor_hartid(node); + } + + return -1; +} + #ifdef CONFIG_PROC_FS static void print_isa(struct seq_file *f, const char *isa) |